Fluid filter

A filter as claimed in any preceding claim in which the filtration channel inner surface is contoured and/or tapered along the length thereof such that the channel is restricted in cross section over at least a portion thereof.

A filter as claimed in any preceding claim in which the filtration channel has a generally square or rectangular cross section.

A filter as claimed in any preceding claim in which the filter casing comprises a moulded casing having first and second parts.

A filter as claimed in any preceding claim in which the fibres are secured in bundles at the outlet end of the filter.

A filter as claimed in any preceding claim in which the filtration channel includes a recessed portion at the outlet end thereof at which the fibres are secured.

A filter as claimed in any preceding claim, further comprising a control valve for controlling the supply of the fluid to be filtered into the filter.

A filter as claimed in any preceding claim in which the filter casing includes a flush liquid storage chamber at the outlet end thereof.

A filter as claimed in any one of the preceding claims including flushing means for flushing the filter in a direction from the outlet end to the inlet end.

A method of operating a filter having a filter casing with a first end and a second end, a filtration channel and a plurality of fibres extending longitudinally of the filtration channel;

• the method comprising passing a supply of pressurised fluid to be filtered from the second end to the first end causing the fibres to expand in a direction perpendicular to their length creating a filter matrix between the fibres and an inner surface of the filtration channel.